Abstract: A filter element for filtering liquids or gases, having a concentrically arranged filter medium with zigzag pleats. The filter medium is provided with end disks on its axial end faces, each end disk having an inside that is connected to the filter medium and an outside that faces away from the filter medium. At least a first end disk carries a valve element which is situated concentrically inside the filter medium. This valve element includes a valve seat which bulges outward above the plane of the outer side of the end disk. The valve element includes a valve body which cooperates with the valve seat and which is arranged on the first end disk so that it is axially movable and is inside of and surrounded by the filter medium.

Abstract: The invention relates to a filter device (1) for filtering liquids, comprising: a filter element (2) having an interior (3) for accommodating a liquid, and a compensating element (5) made of elastically deformable material for accommodating a liquid volume that increases when the liquid freezes. The compensating element (5) is arranged in the interior (3), and a gap (6), in particular an annular gap, for accommodating the liquid is formed between the compensating element (5) and the filter element (3).

Abstract: A filter element has at least one plastic part, a filter medium, and a potting compound that forms a connection between the at least one plastic part and the filter medium. A connecting part is connected fixedly to the at least one plastic part. The potting compound penetrates at least partially into the connecting part.

Abstract: In a method for manufacturing a filter end disc (7), for example for a fluid filter (14) of a motor vehicle, a first plastic molding material (M1) and a second plastic molding material (M2) are injected in succession into a tool mold (1) in a monosandwich method or co-injection method in such a way that the second plastic molding material (M2) is substantially surrounded by the first plastic molding material (M1). To manufacture a fluid filter, the filter end disc (7) is further irradiated by a radiation beam (L) having pre-determined beam characteristics for melting the first plastic molding material (M1), and a filter material (15) is applied to the at least partially melted first plastic molding material (M1). A filter end disc (7), in particular for a fluid filter (14) of a motor vehicle, said disc being manufactured according to a monosandwich method or co-injection method, comprises a first outer plastic molding material (M1) and a second inner plastic molding material (M2).

Abstract: A filter element for cleaning a fluid having a pleated filter medium designed for radial flow, to the outside of which a circumferential reinforcing thread is applied. The outside of the filter medium is divided into two axial sections, to which the reinforcing thread is applied in a plurality of circumferential thread windings, such that the axial distance between directly adjacent thread windings differs in the two sections.

Abstract: A filter element for purifying a fluid at risk of freezing such as a urea-water solution for exhaust gas after treatment has an annular filter body and a support body surrounded by the filter body. The support body is made of an elastomer and is able to yield in a radial inward direction to compensate volume expansion when the fluid freezes.

Abstract: A filter element for filtering liquids or gases, having a concentrically arranged filter medium with zigzag pleats. The filter medium is provided with end disks on its axial end faces, each end disk having an inside that is connected to the filter medium and an outside that faces away from the filter medium. At least a first end disk carries a valve element which is situated concentrically inside the filter medium. This valve element includes a valve seat which bulges outward above the plane of the outer side of the end disk. The valve element includes a valve body which cooperates with the valve seat and which is arranged on the first end disk so that it is axially movable and is inside of and surrounded by the filter medium.

Abstract: A filter element for cleaning a fluid having a pleated filter medium designed for radial flow, to the outside of which a circumferential reinforcing thread is applied. The outside of the filter medium is divided into two axial sections, to which the reinforcing thread is applied in a plurality of circumferential thread windings, such that the axial distance between directly adjacent thread windings differs in the two sections.

Abstract: An electrically powered compressor designed for providing high pressure ratio at low flow rate, yet having low power consumption. The compressor is designed for optimizing efficiency in fuel cell systems. The inventive compressors are however not limited to fuel cell system applications.

Abstract: A turbocharger device for an internal combustion engine including two exhaust gas turbochargers, wherein a regulating device for adjustment of the supply of exhaust gas to one of the turbines or to both turbines is provided in the flow stream of the exhaust gas. A common exhaust gas inflow channel for both turbines is preferably provided on the turbine housing of one of the exhaust gas turbochargers, with two exhaust channel segments for supplying exhaust gas to the respective turbines branching off from the exhaust gas inflow channel. The regulating device is provided where the exhaust gas channel segments branch from the exhaust gas inflow channel on the turbine housing.

Abstract: A turbocharged internal-combustion engine (10), with at least one high-pressure stage (20), with at least one low-pressure stage (30), which is arranged downstream of the high-pressure stage, with bypass piping (24a, 24b) having pipe switch(es) (70, 71), and which connect the exhaust side (12) of the engine with the inlet side of the low-pressure turbine (31) with sensors for detection of the operating parameters of the engine.

Abstract: A turbocharged internal-combustion engine (10), with at least one high-pressure stage (20), with at least one low-pressure stage (30), which is arranged downstream of the high-pressure stage, with bypass piping (24a, 24b) having pipe switch(es) (70, 71), and which connect the exhaust side (12) of the engine with the inlet side of the low-pressure turbine (31) with sensors for detection of the operating parameters of the engine.